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<title>font-size-adjust</title>
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		<a href="http://css.doyoe.com/" target="_blank">CSS3参考手册</a>
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		<a href="../index.htm">属性列表</a>
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		<a href="index.htm" id="category" rel="properties/font" name="font-size-adjust">字体属性</a>
		<span>&#187;</span>
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		<span class="label">相关内容：</span>
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				<strong>其它字体属性参考</strong>
				<span>选择其它项<!--[if lte IE 7]><ins>IE7 and earlier, Get to die</ins><![endif]--></span>
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		<h1 class="tit">font-size-adjust</h1>
		<ul class="info">
			<li><strong>版本：CSS3</strong></li>
			<li>2018.3.21</li>
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		<h2 class="tit">语法：</h2>
		<div class="cont">
			<p><strong>font-size-adjust</strong>：none | <a href="../../values/numeric/number.htm">&lt;number&gt;</a></p>
			<p><strong>默认值</strong>：<mark class="defaultvalue">none</mark></p>
			<p><strong>适用于</strong>：所有元素</p>
			<p><strong>继承性</strong>：有</p>
			<p><strong>动画性</strong>：当值为 <a href="../../values/numeric/number.htm">&lt;number&gt;</a> 时</p>
			<p><strong>计算值</strong>：指定值</p>
			<p><strong>媒　体</strong>：视觉</p>
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		<h2 class="tit">取值：</h2>
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			<dl>
				<dt>none：</dt>
				<dd>不保留首选字体的 x-height</dd>
				<dt><a href="../../values/numeric/number.htm">&lt;number&gt;</a>：</dt>
				<dd>定义字体的 aspect 值。</dd>
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		<h2 class="tit">说明：</h2>
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			<strong>定义元素的 aspect 值，用以保持首选字体的 x-height。</strong>
			<ul>
				<li>字体的小写字母 "x" 的高度与字号之间的比率被称为一个字体的 aspect 值</li>
				<li>高 aspect 值的字体被设置为很小的尺寸时会更易阅读。举例：Verdana 的 aspect 值是 0.58（意味着当字体尺寸为 100px 时，它的 x-height 是 58px）。Times New Roman 的 aspect 值是 0.46。这就意味着 Verdana 在小尺寸时比 Times New Roman 更易阅读。</li>
				<li>可以使用这个公式来为可用字体推演出合适的字号：可应用到可用字体的字体尺寸 = 首选字体的字体尺寸 * （font-size-adjust 值 / 可用字体的 aspect 值）</li>
				<li>详述：如果 14px 的 Verdana（aspect 值是 0.58）不可用，但是某个可用的字体的 aspect 值是 0.46，那么替代字体的尺寸将是 14 * (0.58/0.46) = 17.65px。</li>
				<li>对应的脚本特性为：<strong>fontSizeAdjust</strong>。</li>
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		<h2 class="tit">兼容性：</h2>
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			<ul class="support-type">
				<li><span class="support">浅绿</span> = 支持</li>
				<li><span class="unsupport">红色</span> = 不支持</li>
				<li><span class="partsupport">粉色</span> = 部分支持</li>
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						<th>Values</th>
						<th>IE</th>
						<th>Firefox</th>
						<th>Chrome</th>
						<th>Safari</th>
						<th>Opera</th>
						<th>iOS Safari</th>
						<th>Android Browser</th>
						<th>Android Chrome</th>
					</tr>
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				<tbody>
					<tr>
						<td><strong>Basic Support</strong></td>
						<td class="unsupport">8.0-16.0</td>
						<td class="support">40.0</td>
						<td class="unsupport">40.0-64.0</td>
						<td class="unsupport">8.0-11.0</td>
						<td class="unsupport">40.0-50.0</td>
						<td class="unsupport">8.0-11.3</td>
						<td class="unsupport">4.4-62.0</td>
						<td class="unsupport">28.0-64.0</td>
					</tr>
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		<h2 class="tit">示例：</h2>
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<title>font-size-adjust_CSS参考手册_web前端开发参考手册系列</title>
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<style>
body {
	font: 14px/1.5 Verdana, Times New Roman;
	font-size-adjust: .58;
}
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